What were the concerns about allowing or banning slavery in newly established territories during the 1800s?

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What were the concerns about allowing or banning slavery in newly established territories during the 1800s?

Question Description

What were the concerns about allowing or banning slavery in newly established territories during the 1800s? Your response should talk about the two sides of the decision to include new territories as either slave or free states, not the two sides of the slavery debate in general.

This should be in at least 300 words.

Remember to write in your own words and in complete sentences.